--> Abstract: 3-D Seismic Improves Structural Mapping of a Gas Storage Reservoir (Paris Basin), by F. Huguet and C. Pinson; #90990 (1993).

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HUGUET, FRANCOIS, Gaz de France/DETN, la Plaine St. Denis, France, and CHRISTIAN PINSON*, CGG/Geotop, Massy, France

ABSTRACT: 3-D Seismic Improves Structural Mapping of a Gas Storage Reservoir (Paris Basin)

In the Paris basin, anticlinal structures with closure of no more than 80 m and surface area of a few sq km are used for underground gas storage. At Soings-en-Sologne, a three-dimensional (3-D) survey (13 sq km) was carried out over such a structure to establish its exact geometry and to detail its fault network.

Various reflectors were picked automatically on the migrated data: the top of the Kimmeridgian, the top of the Bathonian, and the base of the Hettangian close to the top of the reservoir. The isochron maps were converted into depth using data from 12 wells. Horizon attributes (amplitude, dip, and azimuth) were used to reconstruct the fault's pattern with much greater accuracy than that supplied by interpretation from previous two-dimensional seismic.

The Triassic and the Jurassic are affected by two systems of conjugate faults (N10-N110, inherited from the Hercynian basement, and N30-N120). Alternating clay and limestone are the cause of numerous structural disharmonies, particularly on both sides of the Bathonian. Ridges associated with N30-N120 faults suggest compressive movements contemporaneous with the tertiary events.

The northern structure in Soings-en-Sologne thus appears to be the result of polyphased tectonics. Its closure (25 m), which is associated either with dips or faults, is described in detail by 3-D seismic, permitting more accurate forecast of the volume available for gas storage.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.